protected void btnSignOut_Click(object sender, EventArgs e)
    {
        if (this.StopProcessing)
        {
            // Do not process
        }
        else
        {
            if (CMSContext.CurrentUser.IsAuthenticated())
            {
                FormsAuthentication.SignOut();
                CMSContext.ClearShoppingCart();

                string redirectUrl = this.RedirectToUrl;

                // If the user has registered Windows Live ID
                if (!String.IsNullOrEmpty(CMSContext.CurrentUser.UserSettings.WindowsLiveID))
                {
                    // Get data from auth cookie
                    string[] userData = UserInfoProvider.GetUserDataFromAuthCookie();

                    // If user has logged in using Windows Live ID, then sign him out from Live too
                    if ((userData != null) && (Array.IndexOf(userData, "liveidlogin") >= 0))
                    {
                        string siteName = CMSContext.CurrentSiteName;

                        // Get LiveID settings
                        string appId = SettingsKeyProvider.GetStringValue(siteName + ".CMSApplicationID");
                        string secret = SettingsKeyProvider.GetStringValue(siteName + ".CMSApplicationSecret");
                        string algorithm = SettingsKeyProvider.GetStringValue(siteName + ".CMSsecurityAlgorithm");

                        // Check valid Windows LiveID parameters
                        if ((appId != string.Empty) && (secret != string.Empty) && (algorithm != string.Empty))
                        {
                            WindowsLiveLogin wll = new WindowsLiveLogin(appId, secret, algorithm);

                            if (Session != null)
                            {
                                // Store info about logout request, for validation logout request
                                Session["liveidlogout"] = DateTime.Now;
                            }

                            // Redirect to Windows Live 
                            redirectUrl = wll.GetLogoutUrl();
                        }
                    }
                }

                CMSContext.CurrentUser = null;

                Response.Cache.SetNoStore();
                UrlHelper.Redirect(redirectUrl);
            }
            else
            {
                string returnUrl = null;
                string signInUrl = null;

                if (this.SignInUrl != "")
                {
                    signInUrl = ResolveUrl(CMSContext.GetUrl(this.SignInUrl));
                }
                else
                {
                    signInUrl = SettingsKeyProvider.GetStringValue(CMSContext.CurrentSiteName + ".CMSSecuredAreasLogonPage");
                }

                if (this.ReturnPath != "")
                {
                    returnUrl = ResolveUrl(CMSContext.GetUrl(this.ReturnPath));
                }
                else
                {
                    returnUrl = UrlHelper.CurrentURL;
                }

                if (signInUrl != "")
                {
                    UrlHelper.Redirect(UrlHelper.AddParameterToUrl(signInUrl, "returnurl", returnUrl));
                }
            }
        }
    }